• Journal of the Korea Institute of Information and Communication Engineering
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• v.18 no.1
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• pp.169-176
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• 2014

According to explosion of smart-devices, demands on N-screen services based on cooperation of multiple screens are rapidly increasing. These N-screen services can provide new user-experience (UX) to users. That is, it can provide technical advances to users. On the other hand, it causes new security problems. In this paper, we analyze conventional web-security attacks, and we propose and analyze new security requirements for migration, combination, and separation of web-contents based on N-screen service scenarios. Also, we develop N-screen cooperation service framework in order to ensure user security.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.19 no.4
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• pp.813-818
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• 2015

In this paper, WiMedia Distributed-MAC protocol is adopted for development of a seamless N-screen wireless service. Furthermore, to provide the OSMU (One Source Multi Use) N-screen service through P2P streaming in the seamless D-MAC protocol, a new Multicast-free DRP Availability IE is proposed and analyzed. In this Multicast-free DRP Availability IE, indicating Multicast DRP Owner and Receiver is required. The ACK frame transmissions are not required for Multicast transmissions in P2P N-screen services. Using this property, the Multicast-free DRP Availability IE scheme is proposed to expand the number of time slots available for unicast and multicast DRP reservations. Simulation results show that our Multicast scheme enhances performances in vewpoints of DRP reservation conflict and throughput.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.19 no.5
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• pp.1091-1096
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• 2015

In this paper, WiMedia Distributed-MAC protocol is adopted for development of multi-hop N-screen wireless services. Furthermore, to provide the multi-hop OSMU (One Source Multi Use) N-screen service through P2P streaming in the D-MAC protocol, a new multi-hop resource reservation scheme is proposed and analyzed to reduce end to end delay. For this Multi-hop resource reservation scheme, a new MSCDRP (Multi-Stage Cooperative DRP) IE is proposed. Simulation results show that our multi-hop MSCDRP scheme reduces the end to end delay and increases throughput at various multi-hop N-screen network environment.

• Journal of Digital Contents Society
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• v.17 no.1
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• pp.59-63
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• 2016

In this paper, we discuss a model for increasing reliability of data through N screen server and client model environment. Our Digital Carousel enables user to share media objects through media synchronization mechanism. We suggest the Digital Carousel system based on CoAP(Constrained Application Protocol) for N-Screen so that the users participated in collaborative work may refer shared media objects as the same view to others. With this sharing system, a group cooperating users can share applications data. This paper explained a performance analysis of a system with function comparison running on multimedia collaboration work based on CoAP and N screen techniques.

• Journal of the Institute of Electronics and Information Engineers
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• v.50 no.6
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• pp.72-81
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• 2013

In this paper, we propose the architecture and user interaction mechanism to implement N-Screen services on Multi-Vision System (MVS) that are not supported in existing systems. N-Screen services enable users to control the MVS displays through any of their devices and share contents among MVS displays and user's active-devices with service continuation at any location. We provide N-Screen interactive services on MVS by introducing N-Screen interaction & session management server and agent. Furthermore, we present some examples of the protocols such as application launching, user interaction for service control and visualcasting to support N-Screen services. In addition, we explain the N-Screen service scenarios for providing split sessions on user's active-devices and launching metadata content on any of his devices at any location supported by these protocols. The simulation result demonstrates the feasibility and performance improvement of the proposed visualcasting mechanisms.

• Journal of Digital Convergence
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• v.10 no.1
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• pp.277-291
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• 2012

Smartphone (smartpad) and cloud computing has grown rapidly. So, the users started getting interested in multi-screen services. However, various OS / platforms due to the increased content development time and cost. Increase the cost of content development for a multi-screen service, it has been an obstacle. To solve this problem in this study, HTML5-based multi-screen service platform standards specification was established. HTML5 is a specification of the next generation of Web standards. Standards specification established by this study were research in terms of the service provider. And, this standards specification can be used independently of the service infrastructure and device. In addition, this standards specification in order to develop a multi-screen services are efficient and easy to use. For verification adequacy of standards specification established in this study, Scenarios technical entries were mapped by standard specification entries.

• Journal of Broadcast Engineering
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• v.19 no.6
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• pp.957-966
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• 2014

N-Screen service has experienced rapid business expansion recently, since consumers' watching patterns have been diversified; also business stakeholders including broadcasting companies, internet service providers, and device manufacturers have joined this field. In order to operate N-Screen service in a stable manner, development of advertisement system where it generates continuous advertisement profit is needed. Especially for a streaming service that delivers live TV programs, the new advertising system has to deliver ads in conjunction with the live streaming system that is in use. In this paper, video advertising system that is congenial to N-Screen is proposed. Both real time video/ad converting scheme and direct video ads delivery function were developed and tested. In addition, ad contents management and statistics management functions have been developed for advertisement managers. This system was implemented in a commercial N-Screen service and it is currently being used for delivering video advertisements.

• Journal of Broadcast Engineering
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• v.18 no.5
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• pp.749-757
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• 2013

This study aims to find out the influences of user behavior, content characteristics, functional factors and user's perception in cost on user satisfaction and continuous intention in N-Screen service. Web survey was conducted for 498 users who have used N screen service. The results show that the most influential factor contributing to user satisfaction is user interface. VOD diversity, payment system, cost, channel diversity are also meaningful factors. Identifying the critical factors which impact on user satisfaction, this study can provide the basic data for activating OTT service in smart media environment.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2011.07a
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• pp.46-49
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• 2011

최근 진행되고 있는 미디어 융합 환경에서 가장 주목 받고 있는 서비스는 N-스크린 서비스라고 할 수 있다. N-Screen 서비스가 무선 환경뿐만 아니라 이동환경에서도 안정적으로 제공되기 위해서 필요한 핵심 요소기술은 클라우드 컴퓨팅 기술일 것이다. 최근에는 통신 사업자를 비롯한 가전 제조사, 인터넷 및 플랫폼 사업자들이 각자의 강점을 살려서 다양한 클라우드 컴퓨팅 기반의 N-스크린 서비스를 제공하기 시작했고 핵심 서비스로 발전시켜 나가고 있다. 본 논문에서는 클라우드 컴퓨팅과 N-스크린의 관계, 주요사업자들의 서비스 현황 및 발전에 필요한 기술적 요구사항에 대해 알아보겠다.

• The KIPS Transactions:PartC
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• v.18C no.3
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• pp.135-142
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• 2011

Recently, the strategy for N-screen service is in the spotlight along with the consumer's need to use contents regardless of time and place due to the rapid development of communication technology, which is meshing with the desire of service providers seeking a new business model. N-screen, as a screen-extension-concept service which enables consumers to continuously share and use contents in various equipments such as TV, computer and portable terminals, is an advanced type of 3-screen service strategy initially proposed by AT&T, an American telecommunication company. In the N-screen service for pay-contents, in order to support continuous screen changes to and from various equipments, temporary watching right should be given to the equipment intended for screen change. However, it is impossible to give the temporary watching right in the present broadcasting environment, adopting an access-control system. In this paper, the access-control technology being used for pay-contents in the present broadcasting environment and the reason for not being able to give temporary watching right, will be examined. After the examination, the solution for delegation of watching right by using an additional key on the basis of currently used access-control technology, will be proposed.